You are correct, anodized aluminum is an insulator, the anodizing
process results in the surface of the aluminum being transformed into
aluminum oxide which is non-conductive.
Alodine or Iriditing is a chemical conversion coating where the surface
of the aluminum is coated with a chromate coating which is conductive.
The problem with this is that the most popular of these treatments uses
hexavalent chromium in the process, which is a no no under RoHs
regulations. There are now chromate conversions that do not use this,
and you may want to look into these coatings.
Keith S. Calhoun
Manufacturing Engineering Manager
SoPark Corporation
3300 South Park Avenue
Buffalo, New York 14218
Phone: 716-822-0434 ext. 237
Fax: 716-822-5062
Email: [log in to unmask]
Thank you for helping SoPark reach our 30th year as a Premier
Electronics Manufacturing Service Provider! ISO 9001:2008 & AS9100B
Certified
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: Thursday, April 14, 2011 7:28 PM
To: [log in to unmask]
Subject: Re: [TN] Class 0 ESDS board assembly transport...
Gregg,
I believe the normal anodize is very non-conductive, as well as the
alodine process.
Not sure if there is a 'semi-'conductive anodize
Steve Creswick
http://www.linkedin.com/in/stevencreswick
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg Owens
Sent: Thursday, April 14, 2011 5:39 PM
To: [log in to unmask]
Subject: Re: [TN] Class 0 ESDS board assembly transport...
Steve:
Reading through more emails. What about aluminum trays and tops but send
them out to a local company to plate with zinc or anodize them to reduce
the risk of chaffing? Just a thought.
Take care,
Gregg Owens | Technical Writer
Wavestream Corporation
(909) 451-6089 | [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Saturday, April 09, 2011 5:22 PM
To: [log in to unmask]
Subject: [TN] Class 0 ESDS board assembly transport...
Hi All,
Hope you all are having (or have had) a good weekend. I'm recovering
from sort of bug that laid me low on Friday.
So today, I'm just taking it easy and have been searching around for the
best solution to a project that we have, and that is trying to come up
with a good way to move our board assemblies around on the production
floor.
What makes this project a bit more complicated than what I've faced
before, is that we need to be able to accommodate 17" X 22" boards
(which we build a fair amount of), and we need to be thinking about
Class 0 (100V) ESDS devices. Yep, they're here now, and ya'll will be
seeing them in the future before too long. Here's one that we're
starting to see now:
http://components.omron.com/components/web/PDFLIB.nsf/0/8B06D373BFF754C6
862574FE007B0E26/$file/2SMES-01_1210.pdf
So, my first thought was Bliss tray carts. I've bought them in in the
past at the other companies that I've worked at. In fact, Bliss has one
of my old Technet postings on their web page recommending them. But I
never had to deal with 17" X 22" boards and Class 0 ESDS devices before.
I thought that their 18" X 26" enclosed cart would work, but the boards
won't fit in their trays. The actual tray width at bottom inside
dimension is only 16.5 inches. So I have to go up to their next cart
size, which is 20" X 26", but they don't offer the enclosed option like
they do with the 18" X 26" cart. They will do custom stuff, but I'm sure
that is going to add big $$$ to the cost.
So I have a multipart question ; if the cart is on conductive casters
and rolling on a static dissipative floor, has good drag chains, the
boards are on ESD trays, and assuming the person moving the cart is well
grounded, does enclosing the carts offer significantly more protection?
I know that having the board completely enclosed inside a faraday cage
is ideal, but how can you practically accomplish that? Especially with
boards as large as 17" X 22"?
I've even been looking at basic, enclosed stainless steel food delivery
tray carts thinking that might be a solution, but had a cow at what they
cost! I was looking for something that would handle anywhere from 10-20
trays, that I could put a 20" X 27" tray in, and they can go for
anywhere from $2000 on up! That's without the trays too...
After spending a good part of the afternoon looking for carts, ESD
trays, and especially after reading this article:
http://circuitsassembly.com/cms/magazine/95/6351
I'm realizing what a task this is. It's not just about the carts, but it
is much, much more than that.
But for now though, I just need to figure out a good way to move our
product on the production floor. I'm curious about how you all have
addressed this.
I think I'm going to watch the NASCAR race now...
Steve
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